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Muscle Assignment
| Question | Answer |
|---|---|
| Attached to bones or, for some facial muscles, to skin | Skeletal |
| Walls of the heart | Cardiac |
| Mostly in walls of hollow visceral organs (other than the heart) | Smooth |
| Skeletal and smooth muscle cells are elongated | Muscle fibers |
| Packaged into the organs called skeletal muscles that attach to the body's skeleton | Skeletal muscle fibers |
| Another name for skeletal muscle | Striated muscle |
| Are skeletal muscles voluntary or involuntary? | Voluntary |
| Encloses each muscle fiber in a delicate connective tissue sheath | Endomysium |
| Several sheathed muscle fibers that are wrapped by a coarser fibrous membrane | Perimysium |
| Many fascicles that are bound together by an even tougher "overcoat" of connective tissue | Epimysium |
| Attaches muscles indirectly to bones, cartilages, or connective tissue coverings | Aponeuroses |
| Tough collagenic fibers, so they can cross rough bony projections, which would tear the more delicate muscle tissue | Tendons |
| Muscle consisting of spindle-shaped, unstriped (nonstriated) muscle cells | Smooth muscle |
| Are smooth muscle voluntary or involuntary | Involuntary |
| Found only in the heart | Cardiac muscle |
| Is cardiac muscle voluntary or involuntary? | Involuntary |
| What cushions the cardiac cells by small amounts of soft connective tissue | Endomysium |
| Branching cells joined by a special junction | Cardiac muscle fibers |
| All the movements of the human body result from what? | Muscle contraction |
| Why are muscle tendons important? | Reinforcing and stabilizing joins that have poorly fitting articulating surfaces |
| What do skeletal muscles protect? | Fragile internal organs |
| Contractile organelles found in the cytoplasm of muscle cells | Myofibrils |
| The smallest contractile unit of muscle; extends from one Z disc to the next | Sarcomere |
| Filaments composing the myofibrils | Myofilament |
| Two types of myofilament | Actin and myosin |
| Larger thick filaments | Myosin filaments |
| One of the principal contractile proteins found in muscle | Myosin |
| A contractile protein | Actin |
| Neuron process that carries impulses away from the nerve cell body | Axon |
| The region where a motor neuron comes into close contract with a skeletal muscle cell. | Neuromuscular Junction |
| Chemical released by neurons that may stimulate or inhibit them | Neurotransmitter |
| The ability to shorten | Contractility |
| To respond to stimulus | Excitability |
| To be stretched | Extensibility |
| The ability to recoil and resume their resting length after being stretched | Elasticity |
| A bundle of nerve or muscle fibers bound together by connective tissue | Fasciculi |
| What's the function of a neuromuscular junction? | Stimulates skeletal muscle cells with neurotransmitters |
| Thick filaments of muscle fibers slide past thin filaments during muscle contraction, while these groups remain at constant length. | Sliding filament mechanism of muscle contraction |
| A single rapid contraction of a muscle | Muscle twitch |
| When the muscle goes into uncontrollable spasms. | Muscle tetany |
| A sustained partial contraction of a muscle in response to stretch receptor inputs and keeps the muscle healthy. | Muscle tone |
| Attachment of a muscle that remains relatively fixed during muscular contraction. | Origin |
| The movable attachment of a muscle as opposed to its origin | Insertion |
| Muscles cooperating with another muscle or muscle group to produce a desired movement. | Synergist |
| Muscles that act in opposition to an agonist or prime mover | Antagonists |
| Muscle whose contractions are primarily responsible for particular movement. | Prime Mover |
| Attach the tongue to other structures | Extrinsic tongue muscles |
| Lies entirely within the tongue | Intrinsic tongue muscles |
| The fine transparent tubular sheath which envelops the fibers of skeletal muscles. | Sarcolemma |
| A membrane-bound structure found within muscle cells. | Sarcoplasmic Reticulum |
| A motor neuron and all the muscle cells it supplies. | Motor unit |
| A chemical transmitter substance released by certain nerve endings. | Acetylcholine |
| A symptom that decreases your muscles’ ability to perform over time. | Muscle fatigue |
| The movable attachment of a muscle as opposed to its origin. | Insertion |
| Single, very long, cylindrical, multinucleate cells with very obvious striations | Skeletal |
| Branching chains of cells; uninucleate, striations; intercalated discs | Cardiac |
| Single, fusiform, uninucleate; no striations | Smooth |
| The product of anaerobic metabolism, especially in muscle | Lactic acid |
| Soft and flabby skin muscle | Flaccid |
| Reduction in size or wasting away of an organ or cell resulting from disease or lack of use | Atrophy |
| Type of exercise that helps blood supply in the muscles increase | Aerobic |
| Decreases the angle of the joint and brings two bones closer together | Flexion |
| Increases the angle or distances between two bones or parts of the body | Extension |
| A movement of a bone around its longitudinal axis | Rotation |
| Moving a limb away from the body | Abduction |
| Moving a limb towards the body | Adduction |
| The proximal end of the limb is stationary, and its distal end in a circle | Circumduction |
| Up-and-down movements of the foot at the ankle | Dorsiflexion and plantar flexion |
| To invert and evert the foot | Inversion and eversion |
| The movements of the radius around the ulna. | Supination and pronation |
| The action by which the thumb is used to touch the tips of the other fingers on the same hand | Opposition |
| The action of a muscle can be inferred by the muscle's position as it crosses a joint | Muscle action |
| Rectus, oblique, etc | Direction of the muscle fibers |
| Maximus, minimus, longus, etc. | Relative size of the muscle |
| Temporalis and frontalis | Location of the muscle |
Created by:
rofrale1
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